Potential Field Source Surface Model and Solar Wind Prediction

Details Potential Field Source Surface Model and Solar Wind Prediction Potential Field Source Surface Model and Solar Wind Prediction

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh23c..03p&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SH23C-03

Physics

2169 Sources Of The Solar Wind, 7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields

Scientific paper

Various magnetic activities of the Sun causes disturbances in the near-Earth enviornment as well as on the weather and technology on Earth. "Addressing these disturbances and predicting them well in advance are the main task of Space Weather research. Much of the solar side of Space Weather is concerned with the accurate prediction of solar wind and its properties which are closely related to the coronal magnetic field. Since a direct measurement of the coronal magnetic field is still limited to strong field regions, solar wind predictions are based on theoretical models of the corona. The primary prediction scheme of the solar wind speed currently used at SEC is based on the empirical relationship between the flux tube expansion (FTE) factor obtained using Potential Field Source Surface (PFSS) model of the corona and the solar wind speed near the Earth. Though successful, this scheme has significant discrepancies. We have studied, using the near-Earth saltellites data as well as near--Sun Helios data, the possible causes of these discrepancies. In our study, FTE at the source surface were obtained using two different coronal models: PFSS model and the Current--Sheet Source Surface (CSSS) model. We present the results of this investigation and a comparison of the two models.

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